Yoomba is a new web service that lets you call or text chat with anyone in the world who has an email address (that means practically everyone) - no registrations or complicated setup required.
When Yoomba spots an email address on your screen, it will add two icons - one for making voice phone calls and the other one for instant messaging. (see a screenshot from my GMail inbox below) - this works for Outlook, GMail, Yahoo and other web pages.
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